adder: see viper viper, any of a large number of heavy-bodied, poisonous snakes of the family Viperidae, characterized by erectile, hypodermic fangs. The fangs are folded back against the roof of the mouth except when the snake strikes.
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Any of several venomous snakes of the viper family (Viperidae) and the death adder, a viperlike elapid. Vipers include the common adder, puff adders, and night adders. Adders occur in Europe, Asia, Africa, and Australia. They range in length from 18 in. to 5 ft (45 cm to 1.5 m). The puff adder of Africa and the death adder of Australia and the nearby islands are particularly venomous, with a bite potentially lethal to humans. The name is also used for other snakes (e.g., the hognose snake).
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Puff adder (Bitis arietans)
(credit: Copyright © 1971 Z. Leszczynski—Animals Animals)
adder
An elementary electronic circuit that adds the bits of two numbers together.
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1. a common viper, Vipera berus, that is widely distributed in Europe, including Britain, and Asia and is typically dark greyish in colour with a black zigzag pattern along the back
2. any of various similar venomous or nonvenomous snakes
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a person or thing that adds, esp a single element of an electronic computer, the function of which is to add a single digit of each of two inputs
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